It’s never too late to have a Boqueria. That’s one lesson to draw from the arrival of the nationally renowned tapas chain in the Seaport, 17 years after its first location opened in NYC’s Flatiron District. Since then, the paella-pushing institution founded by Yann de Rochefort has expanded across a number of cities. So, with a stylish new Boqueria landing in Boston, now’s as good a time as any to delve into four key things that local diners can expect to find at the new Seaport hotspot.